Procedure for obtaining modified polymers from conjugated diens. (Machine-translation by Google Translate, not legally binding)

摘要

Process for obtaining modified polymers of conjugated dienes, or of conjugated dienes mixed with vinyl-substituted aromatic compounds, in the presence of a catalyst constituted by an organoalkali metal, characterized by comprising the addition to the reaction mixture, before the conclusion of the polymerization, of a small amount of chloroprene, of vinylidene chloride or of a compound of the formula ** (See formula) ** where X is hydrogen, chlorine, bromine, iodine, an alkyl radical containing 1 to 6 atoms, or a cycloalkyl radical containing up to 6 carbon atoms, the total number of carbon atoms in the groups being not more than 6 X, and, when said compound has the formula I or II, an X at least is a halogen atom in position 2 or 4; and when said compound has the formula III, an X at least is a halogen atom in position 1 or 3, thus producing a polymer that has a lower tendency to flow in cold and/or a higher Mooney viscosity. (Machine-translation by Google Translate, not legally binding)